Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
  • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
  • F02M69/04—Injectors peculiar thereto
  • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
  • F02M69/044—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the intake conduit downstream of an air throttle valve
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
  • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
  • F02M61/145—Arrangements of injectors with respect to engines; Mounting of injectors the injection nozzle opening into the air intake conduit
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
  • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
  • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
  • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
  • F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/85—Mounting of fuel injection apparatus
  • F02M2200/858—Mounting of fuel injection apparatus sealing arrangements between injector and engine
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S277/00—Seal for a joint or juncture
  • Y10S277/91—O-ring seal

Definitions

• This invention concerns mounting of fuel injectors in internal combustion engines.
• Modern automotive engines utilize fuel injectors for precisely controlled injection of atomized fuel charges into each engine cylinder for each combustion cycle.
• the fuel injectors are elongated, generally cylindrical devices which are each received into a respective one of a series of bores formed along a fuel rail, with an internal passage communicating with the interior of the fuel rail in order to be supplied with fuel under pressure.
• the fuel is pumped into the interior of the fuel rail to supply a plurality of injectors sealed in the bores arranged along the length of the fuel rail.
• the tip of each injector is seated in an intake manifold bore aligned with the fuel rail bore, to be positioned to spray a charge of fuel into the associated engine cylinder.
• the injector is operated electronically to open a valve included in the injector to allow a metered volume of fuel to be sprayed out of the fuel injector tip.
• Fuel rails have in the past been constructed of metal tubes attached to the intake manifold, itself typically constructed of cast aluminum.
• a fuel injector mounting arrangement and method including an oversized fuel injector seat bore formed in each intake manifold runner, allowing the fuel injector to be tilted to allow it to be advanced through the manifold seat bore until the upper end of the injector can be rotated to be aligned beneath its associated fuel rail bore.
• a special manifold cylinder head seal which has portions fit around the intake manifold opening as with conventional seals, but which is formed with an angled tubular projection located to extend into the oversized fuel injector seat when the seal is installed.
• the tubular seal projection is fit over the fuel injector tip, locating it within the seat.
• a shoulder on the fuel injector tip abuts the end face of the protrusion for axial location and retention of the fuel injector in its pocket.
• the fuel rail intake manifold with its complement of fuel injectors can then be installed onto the engine cylinder head as a single assembly, the seal being compressed as the manifold is bolted against the cylinder block mounting surface.
• the tubular portion is squeezed within the injector seat bore and onto the injector tip as the seal is compressed, sealing both surfaces.
• Figure 1 is a fragmentary sectional view taken through an integral intake manifold and fuel rail, showing a fuel injector tilted to be inserted in an oversized manifold injector seat.
• Figure 2 is a fragmentary sectional view of an intake manifold and integral fuel rail showing the fuel injector inserted in the fuel rail pocket and loosely guided in the oversized injector seat.
• Figure 3 is a transverse sectional view taken through an intake manifold injector seal.
• Figure 4 is a plan view of the seal shown in Figure 3.
• Figure 5 is a fragmentary sectional view of the molded intake manifold with integral fuel rail having a fuel injector and seal installed.
• Figure 6 is a fragmentary sectional view of an engine cylinder head having the intake manifold assembled thereto.
• FIG. 1 a portion of a molded composite intake manifold 10 is shown, which has an integral fuel rail 1 2 formed therein.
• the intake manifold 1 0 has a plurality of runners 14, one for each engine cylinder, one of the runners 1 4 shown, which has a mounting flange 1 6 for assembly to the cylinder head of the engine (not shown in Figure 1 ).
• the fuel rail 12 defines a flow passage 18 which receives a flow of fuel under pressure from the fuel tank during engine operation in the well known manner.
• the fuel rail 1 2 includes a series of protuberances 20 projecting towards a respective manifold runner 14 formed with an open bore 22, defining an injector receiving pocket.
• the intake manifold runner 14 is itself formed with a boss having formed therein an oversized bore 24 aligned with the fuel rail pocket bore 22, but axially spaced apart a distance substantially shorter than the overall length of a fuel injector 26 to be installed.
• the upper end or inlet end 30 (carrying preassembled O-ring 32) can now clear the protuberance 20 and be swung into alignment with the fuel rail pocket bore 22. This enables the now aligned upper end 30 to be inserted into the fuel rail pocket bore 22, the O-ring 32 compressed to establish a seal as shown in Figure 2.
• a manifold runner seal 34 is shown in Figures 3 and 4, and includes a main seal portion 36 comprised of a molded ring of an elastomeric material configured to completely encircle the opening at the end of the manifold runner 14, matched to the perimeter configuration of a seal recess 38 in the intake manifold runner flange 1 6, here shown as a rectangular configuration.
• an injector locating and sealing tubular portion 40 configured as a tubular projection angled outwardly along an axis inclined to the general plane of the ring formed by the main portion 36 of the seal 34.
• the inner bore of tubular portion 40 is configured to receive the tip 28 of the injector 26, while the outside diameter thereof is sized to be fit to the injector seat bore 24 in the manifold runner 14.
• tubular portion 40 can first be inserted into the bore
• the main portion 36 is then installed in the recess 38 in runner flange 1 6 to complete the subassembly.
• a plurality of runners and injectors require the installation of each of the corresponding seals, to complete the subassembly comprised of the intake manifold fuel rail 10 injectors 26 and seals 34, as shown in Figure 5.
• This subassembly can then be installed on the engine cylinder head 42 of an internal combustion engine 41 , an opening 43 in each runner aligned with an intake port 45 in the cylinder head 42, the manifold flanges 1 6 bolted to the cylinder head surface 44 by threaded bolts or studs (not shown). This compresses the slightly protruding seal 34 to establish sealing between the intake manifold fuel rail 1 0 and the cylinder head, as well as compressing injector portion 40 between the injector tip outside and the inside of the runner boss bore 24.
• the cylinder head surface 44 is disposed in opposition to the inclined wall of the injector seat bore 24 as well as the outside surface of the injector tip 28.
• compression of the seal material by the surface 44 creates a squeezing of the seal material against the tip outside surface, as well as the inside surface of the bore 24. This establishes sealing against both surfaces to eliminate the need for a separate injector tip O-ring.
• the protruding injector portion 40 locates the associated injector 26 in the oversized bore 24, as well as axially against a shoulder 46 formed on each injector 26, as shown in Figure 6.
• the injectors are securely captured and cannot come loose from the intake manifold assembly.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Fuel-Injection Apparatus (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=24357194

Family Applications (1)

Country Status (6)

Cited By (2)

Families Citing this family (27)

Citations (3)

Family Cites Families (8)

• 1996
  • 1996-01-22 US US08/589,237 patent/US5682859A/en not_active Expired - Lifetime
• 1997
  • 1997-01-10 DE DE69711847T patent/DE69711847T2/de not_active Expired - Lifetime
  • 1997-01-10 WO PCT/US1997/000311 patent/WO1997027398A1/en not_active Application Discontinuation
  • 1997-01-10 JP JP9526879A patent/JP2000504079A/ja active Pending
  • 1997-01-10 KR KR1019980705616A patent/KR19990081904A/ko not_active Application Discontinuation
  • 1997-01-10 EP EP97901957A patent/EP0876553B1/de not_active Expired - Lifetime

Patent Citations (3)

Non-Patent Citations (1)

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